Illuminated switch construction with releasing slidable cam



A. A. Dl PILLA Aug. '4, 1970 5 Sheets-Sheet 1 Filed April 18, 1968 FIG-I m m @suws qfi 4 pt m -i 5 l2 s 4. K 5 g L C 2 I 6 0 2 H 2 /-4 35 18% 2 0 IO! 7 m O 8 I m 8 G 0 {lit l 2 H \II 2 n m7 E4 Tm w \/H n u MHUU I W M I 6 a 5 8 m 2 INVENTOR.

HIS ATTORNEYS 1 970 A. A. DIAPILLA {3,522,402

ILLUMINATED SWITCH CONSTRUCTION WITH RELEASINQ: SLIDABLE CAM Filed April 18, 1968 5 Sheets-Sheet 2 FIG-4 I08 INVENTOR. ANTHONY A. DiPl LLA HIS ATTORNEYS Aug. 4, 1970 A. A. DI PILLA ILLUMINATED SWITCH CONSTRUCTION WITH RELEASING SLIDABLE CAM Filed Aprii 18, 1968 FIG-l3 5 SheetsSheet- 4.

INVENTOR. ANTHONY A. Di Pl LLA HIS ATTORNEYS United States Patent 3,522,402 ILLUMINATED SWITCH CONSTRUCTION WITH RELEASING SLIDABLE CAM Anthony A. Di Pilla, Philadelphia, Pa., assignor to Robertshaw Controls Company, Richmond, Va., a corporation of Delaware Filed Apr. 18, 1968, Ser. No. 722,305 Int. Cl. H01h 9/16 US. Cl. 200-167 15 Claims ABSTRACT OF THE DISCLOSURE This application discloses a switch construction with a lamp holder and a push actuator relatively movably secured together and being insertable as a unit into a casing aperture. A casing supported locking lever engages and locks the lamp holder in the casing during an initial insertion procedure. The push actuator can then be repeated pushed in and released to produce actuated and unactuated condition of the switch construction. A push actuator supported lever and an independently slidable cam unlock the lamp holder from the casing during a releasing pulling out operation and releasing pushing in operation of the push actuator. This permits removal of the lamp holder and lamp replacement in the lamp holder.

This invention relates to an illuminated switch construction with releasing slidable cam.

A feature of this invention includes an illuminated switch construction with a lamp holder and a push actuator relatively movably secured together and being insertable as a unit into a casing aperture. A casing supported locking lever engages and locks the lamp holder in the casing during an initial insertion procedure. The push acmator can then be repeatedly pushed in and released to produce actuated and unactuated condition of the switch construction. A push actuator supported lever and an independently slidable cam unlock the lamp holder from the casing during a releasing pulling out operation and a releasing pushing in operation of the push actuator for removal of said lamp holder from the casing.

Another feature of this invention includes an outwardly extending latching shoulder and an outwardly slanting wedge on said lamp holder to cause said casing supported locking lever to latch said lamp holder in the casing.

Another feature includes a cooperation between the shape of said casing supported lever, the shape of said push actuator lever, and the shape of said independently slidable cam to cause said releasing pulling out of operation and said releasing pushing in operation of said push actuator to cooperate to release said lamp holder from said casing.

Other features are apparent from this description, the appended claimed subject matter, and/or the accompanying drawings, in which:

FIG. 1 is an exploded perspective view of the push button assembly separated from the casing and switch means of this invention.

FIG. 2 is an exploded cross section taken along the line 2-2 of FIG. 1.

FIG. 3 is a diagrammatic cross section of the parts shown in FIG. 2 with the push button assembly partly initially inserted in the casing.

FIG. 4 is a view similar to FIG. 3, with the push button assembly having been completely initially inserted in the casing.

FIG. 5 is a view similar to FIG. 4, but showing the push actuator released, to place the apparatus in condition for repeated actuating and releasing operation.

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FIG. 6 is a view similar to a part of FIG. 5, and showing the push actuator near the end of the releasing pulling out action.

FIG. 7 is a view similar to FIG. 6, and showing the push actuator substantially at the end of the releasing pushing in action.

FIG. 8 is a view showing the parts subsequent to the positions of FIG. 7, and showing the push actuator substantially pulled out of the casing, and the lamp holder means in the process of being pulled out, this figure also showing the position of the parts of the push-button assembly at an early stage of the initial pushing in action.

FIG. 9 is an enlarged cross section showing certain parts of FIG. 3 slightly after their position in FIG. 3, in full lines, and showing the push actuator lever in dotted lines in a position slightly before the position shown in FIG. 3.

FIG. 10 is a view similar to FIG. 9 and showing the parts at a slightly later stage than in FIG. 9, and before they reach the stage of FIG. 4.

FIG. 11 is a view similar to FIGS. 9 and 10 but showing the parts substantially in the position of FIG. 5.

FIG. '12 is a view similar to a portion of FIG. 11 and showing the push actuator lever in dotted lines during an early stage of the releasing pulling out action, prior to the position of FIG. 6, and in full lines substantially in the completed releasing pulling out action, and substantially as shown in FIG. 6.

FIG. 13 is a view similar to FIG. 12 and showing the parts just before their position in FIG. 7, and before the lamp holder is completely released.

FIG. 14 is a perspective, diagrammatic view of the locking lever means.

FIG. 15 is a diagrammatic perspective view of the cam means.

FIG. 16 is a perspective view of a portion of the push button assembly as shown in FIG. 1, but showing the locking lever locked over the shoulder of the lamp holder, as it would be at the right side of FIG. 5.

FIG. 17 is a perspective view, somewhat similar to FIG. 16, but showing the corresponding parts on, the left-hand side of the lamp holder means in FIG. 5 and which are hidden in FIG. 1.

FIG. 18 is a diagrammatic perspective view of a portion of the push actuator, and the push actuator lever depending therefrom.

FIG. 19 is an enlarged cross section of the cam means taken along a plane different from that shown in FIGS. 9-13 and taken along the line 1919 of FIG. 20.

FIG. 20 is a diagrammatic cross section in reduced scale, taken along the line 20-20 of FIG. 13.

FIG. 21 is a diagrammatic view of the lamp holder means taken along the line 3232 of FIG. 2.

Certain words may be used in this specification and in the claimed subject matter indicating direction, relative position, and the like. Such words are used for the sake of brevity and clearness. It is to be understood, however, that such words are used only in connection with the views of the drawings, and that in actual use, any parts or movements described by such words may have entirely different direction, relative position, and the like. Examples of such words are vertical, horizontal, upper, lower, and the like.

A casing 20, according to this invention, may have a casing aperture means 22. A push-button assembly means 24 may be insertable in and removable from the casing 20 through such aperture means 22.

The push button assembly means may include an inward, push actuator means 26 and a lamp holder means 28 relatively movably secured together and being insertable into and removable from the casing 20 as a unit through the aperture means 22. When so inserted, said push actuator means 26 is actuatable to an actuated condition, substantially as shown in FIG. 4, and to an unactuated condition, substantially as shown in FIG. 5, by the pushing in action of FIG. 4 and the release action of FIG. 5 of said push actuator means 26.

Locking means are provided to lock said lamp holder means in locked condition in said casing by said initial pushing inaction of said push actuator means 26, followed by said releasing action of said push actuator means 26, as will become apparent. This may include an outwardly extending latching shoulder means 30 and an outwardly slanting wedge means 32 below said shoulder means 30, on said lamp holder means 28, as shown in FIGS. 1-11. This may also include an upwardly directed and inwardly biased locking lever means 34 carried by the casing and having a shoulder latching locking lever upper end 36. Such locking lever upper end 36 may be outwardly moved by the wedge means 32, as shown in FIGS. 9 and 10 and then released back over said shoulder means 30, as in FIG. 11, during said initial pushing in action.

Withdrawing means to withdraw said lamp holder means 28 from locked condition by a releasing pulling out action of said push actuator means 26 as in FIG. 6, followed by a releasing pushing in action of said push actuator means 26, as in FIG. 7, may be provided. This may include a cam means 38, which is upwardly and downwardly slidable on said lamp holder means 28 adjacent said shoulder means 30 and slanting wedge means 32. The withdrawing means may also include an outwardly biased and downwardly directed push actuator lever means 40, which passes through said lamp holder means 28. Such push actuator lever means may engage a stop means 42 to stop said initial pushing in action. Such push actuator lever means 40 may pass upwardly past said cam means 38 and then bias over said cam means 38, as shown in FIG. 12, during said releasing pulling out action. Such lever means 40 may then push said cam means 38 down during said releasing pushing in action, as shown in FIGS. 13 and 7 to push said latching locking lever upper end 36 off said shoulder means 30 to release said lamp holder means 28 from latched condition, to remove said push actuator means 26 and said lamp holder means 28 as a unit out of said aperture means 22 and out from the casing 20 to the position of FIGS. 1 and 2.

In many of the figures, the left-hand locking lever means 34 and the left hand push actuator lever means 40 have been illustrated in enlarged scale. However, the same action occurs in the corresponding right hand lever means 34 and 40.

Further details of such means will become apparent as the description proceeds.

The locking lever means 34 may have a locking lever lower end 44, which is carried by the casing 20. The looking lever upper end 36 may have an outwardly bent shoulder latching or oppositely directed plate 46, which engages the two sections of the shoulder means 30, 30, as is shown in perspective in FIGS. 16 and 17, and in cross section in other figures.

The locking lever means 34 may have an outwardly directed locking lever upper hump 48 and an inwardly directed locking lever lower hump 50 for a purpose to become apparent.

The lamp holder means 24 may have a lamp holder opening 52 with a lever actuating rim 54. The opening 52 is provided to receive the downward autcator lever 40, and the rim 54 actuates certain parts of the lever 40 in a manner to become apparent.

The push actuator lever 40 has a lower outwardly and downwardly directed lower end 56, an intermediate outwardly directed push actuator lever hump 58, these parts 56 and 58 cooperating with other parts to produce the actions herein described, as will become apparent.

The cam means 38 has two outer upwardly directed arms 60, which slide in grooves 62 in the lamp holder 28.

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The cam means 38 has an actuator lever end receiving cam surface 64, FIG. 13, an upper locking lever hump actuating cam wedge 66, and an outwardly slanting lower cam surface 68, to cooperate with the parts of this invention as will become apparent.

The stop means 42 may be a terminal block secured in the casing 20 and having upwardly biased terminal contact means or contacts 70, which are slidable in the block 42 and which are upwardly biased by springs 72 to cause the contacts 70 to engage the lamp contact means or contacts 74 in the lamp holder means 28. The terminal contact means 70 upwardly biases the lamp holder means 28 upwardly with the latching shoulder means 30 against the locking lever upper end 46, as in FIGS. 4, 5, 11, 12 and 13.

The terminal block 42 also has an unwardly biased plunger 76 which is downwardly actuated and released by operation of the push actuator means 26 while the push-button assembly 24 is in operating condition in the casing 20, as in FIGS. 4 and 5. A switch or switch means 78 is connected to the casing 20 by any suitable means and is actuatable to actuated condition and unactuated condition by the pushing in action and release action on the push actuator means 26 and on the plunger 76, as in FIGS. 4 and 5.

The push actuator 26 may have a downward vertical bar 80 which passes downwardly through the lamp holder means 28 and vertically reciprocates the plunger 76, as in FIGS. 4 and .5.

The plunger 76 is held in an opening 82 in the terminal block 42, FIG. 2. A compression spring 84 upwardly biases the plunger 76. The spring lower end 85 engages the flange 86 and the spring upper end engages a split ring 88, which is secured in a proper groove in the plunger 76. If desired, a bearing 90, of nylon and the like, may be provided at the lower end of the casing 20 to receive and guide the lower end of the plunger 76. Another split ring 92 may be secured in a groove in the plunger 76 and limits the upward movement of the plunger 76 when such ring 92 engages the bearing 90. The switch 78 may be supported from the casing 20 by any suitable bracket means 94, as is obvious, and the details of which are not material to this invention.

The switch 78 may have an actuatable rod 96 which is actuated by the lower end of the plunger 76, so that the switch 78 is in actuated condition when the plunger 76 is down, and is in unactuated condition when the plunger 76 is up.

The switch 78 may have connectors 98 which may be connected to any circuit to be controlled. If desired, the circuit controlled by the terminals 98 may be connected to the terminals 100 of the contacts 70 in such a manner that the various lamps 102 may be illuminated in various sequences under the control of such circuit, as the push actuator 26 is sequentially pushed in.

The push actuator means 26 may have a cross bar 104 which is integral with, or supported by the push actuator side wall 106 by any suitable formation 107. The cross bar 104 supports the vertical bar 80 and the downwardly directed lever means 40. The side wall 106 may support a lens 108 slidably between the flanges 110 and the spring fingers 112 which are inwardly formed in the side wall 106.

The lamp holder means 28 may have a main body formed by upper and lower sections 114 and 116 which may be held together by bars 118 which are riveted at 120.

The lamp holder means 28 may have one or more flange-type of lamps .102, which have lower flanges 119 with central contacts 74. These lamps may be pulled downwardly out of the lamp holder means 28, when it is out of the casing 20, as in FIGS. 1 and 2 in a manner now well known. The lamps 102 are downwardly slidable in openings 121 of a suitable character in the lamp holder means 28. The glow of these lamps is visible through the lens 108. If desired, the upper ends of the lamps 102 may be covered with flexible colors, not shown, which cause individual lamps to display different colors, also as is well known.

The lamps 102 have insulated cylindrical metallic contacts 122 FIG. 7, which are contacted by inward resilient flange contacts 124. The flange contacts 124 are integral with an carried by a thin metal plate 126, FIG. 21, which is riveted to the lower section .116 by bars 118 with rivets 120 which rivet the sections 114 and 116 together. The plate 126 forms the neutral terminal for lamp contacts 124. The plate may be contacted by a neutral upward contact member 128. FIG. 1, which may be similar to but of opposite polarity from the contact members 70.

The vertical bar 80 passes through an opening means 130 in the thin metal plate 126 and section 116 of the lamp holder main body.

OPERATION In operation, the push button assembly means 24, including the push actuator 26 and the lamp holder 28, may be initially inserted in the casing 20 through the aperture means 22, to cause the push actuator 26 to be actuatable to an actuated condition and an unactuated condition by pushing in action and release action of the push actuator 26, between the positions of FIGS. 4 and 5.

The initial pushing in action which takes place when the push button means 24 is pushed in causes the slanting surface or wedge means 32 to engage the outwardly bent shoulder end 46, FIG. 9, to move the locking lever 34 outwardly as the lamp holder means 28 is pushed down by the cross bar 104 of the actuator means 26. The actuator lever 40 does not engage the cam means 38 on its way down, in FIG. 9, since the lever hump 58 engages the opening rim 54, so that the lower lever end 56 is pushed rightwardly away from the cam 38 on its way down, as shown in dotted lines, FIG. 9, so that the push actuator lever 40 can then continue downwardly as shown in full lines in FIGS. 9 and 10 without disturbing the cam 38. The lamp holder 28 can be further pushed down by the cross bar 104, as shown in FIGS. 3 and 4 and 9 and 10, until the lamp holder is pushed down where the shoulder 30, FIGS. 4 and 11, moves below the latching end 46 of the lever 34, as shown in FIG. 11, so that the wings 48 of the end 46 move over the two shoulders 30, FIGS. 16 and 17, and lock the lamp holder within the casing 20, in the position of FIG. 4, with the push acuator 26 being movable up and down between the positions of FIGS. 4 and 5.

As long as the lamp holder 28 and push actuator 26 are in the positions of FIGS. 4 and 5, the push actuator 26 can be moved in and released outwardly as many times as desired, to actuate the switch 78 if such switch is used.

When it is desired to remove the push button assembly 24 from the casing 20, the push actuator 26 is pulled outwardly, as shown in FIG. 6, from the position of FIG. 5. This causes the push actuator lever 40 to move upwardly without disturbing the cam 38, in FIG. 12, as shown by the dotted line of lever 40, with the hump 58 holding the lever 40 rightwardly until the lever 40 reaches the full line position of FIG. 12 and the corresponding position of FIG. 7, so that the lever end 56 moves over the upper receiving surface 64 of the cam 38, as shown in FIG. 12. Thereafter, the push actuator 26 is pushed down, so that the lever end 56 pushes down on the surface 64, and this causes the slanting lower cam surface 68 and the lower hump 50 to cooperate to move the upper lever end 46 to move outwardly over and away from the shoulder 30, as shown in FIG. 13 and as completed in FIG. 7. While the lever 40 holds the cam 38 down, as shown in FIG. 7, the upwardly biased contacts 70 push the lamp contacts 74 upwardly so that the shoulder 30 can be pushed upwardly above the locking lever end 46, so that thereafter the push actuator 26 and the lamp holder 28 may be pulled out as a unit from the casing as 6 shown in FIGS. 8 and 2. Thereafter, one or more lamps 102, etc., can be removed and replaced, as is well known, and the push button means 24 can be reinserted in the casing 20.

A new, useful and unobvious illuminated switch construction with slidable cam means has thus been provided.

What is claimed is:

1. In combination:

a casing having a receiving casing aperture means;

push button assembly means including an inward push actuator means and a lamp holder means relatively rnovably unitarily secured together and being insertable and removable from said casing as a unit, said push button assembly means being disposed in said aperture means and when in a locked condition thereof said push actuator means being actuatable to actuated condition and unactuated condition by pushing in action and release action'bn said push actuator means;

locking means carried by said casing and said push button assembly means locking said lamp holder means in said locked condition in said casing by an initial pushing in action of said push actuator means, followed by a releasing action of said push actuator means, said locking means including latch means rnovably carried by said casing and locking said lamp holder means during said initial pushing in action;

withdrawing means carried by said push-button assembly means and operatively associated with said latch means for moving said latch means to an unlocking position thereof to withdraw said lamp holder means from said locked condition by a releasing pulling out action on said push actuator means followed by a releasing pushing in action of said push actuator means;

said latch means comprising an upwardly directed and inwardly biased locking lever means having a locking lever lower end carried by said casing and having a locking lever upper end with an outwardly bent, shoulder latching end, said locking lever means having an outwardly directed locking lever upper hump and an inwardly directed locking lever lower p;

said locking means of said lamp holder means compris ing an outwardly extending latching shoulder means, an outwardly slanting wedge means below said shoulder means and a lamp holder opening with a rim adjacent said shoulder means;

said withdrawing means of said lamp holder means comprising an upwardly and downwardly slidable cam means behind and adjacent said shoulder means and slanting wedge means, said cam means having an upper actuator lever end receiving cam surface, an upper locking lever hump actuating cam wedge, and an outwardly slanting lower cam surface to actuate said locking lever lower hump;

said push actuator means having an outwardly biased,

downwardly directed push actuator lever means passing through said lamp holder opening and having a lower outwardly and downwardly directed push actuator lever lower end and an intermediate outwardly directed push actuator lever hump, said initial pushing in action of said push actuator means causing said outwardly slanting wedge means to move said outwardly bent shoulder latching end outwardly past said shoulder means and to allow said shoulder latching end to latch over said shoulder means;

said initial pushing in action also causing said push actuator lever hump means to engage said opening rim and to push said actuator lever lower end past said cam means;

said initial pushing in action also causing said inwardly directed locking lever lower hump to move said cam means relatively upwardly in said lamp holder means;

said releasing pulling out action causing said push actuator lever lower end to be pulled up above said upper cam surface,

said releasing pushing in action causing said actuator lever lower end to engage said lever end receiving cam surface to push said cam means downwardly and to cause said lower cam surface to push said locking lever lower hump outwardly to move said locking lever latching end outwardly to release said shoulder means, and to release said lamp holder means for removal from said casing.

2. A combination according to claim 1 in which a terminal block is secured in said casing and has upward 1y biased terminal contact means to engage lamp contact means in said lamp holder means, said terminal contact means upwardly biasing said lamp holder means and said latching shoulder means against said locking lever shoulder latching end.

3. A combination according to claim 2 in which a switch is connected to said casing, said switch being actuatable to actuated condition and unactuated condition by said pushing in action and release action on said push actuator means.

4. A combination according to claim 2 in which said terminal block has an upwardly biased plunger which is downwardly actuated and released by operation of said push actuator means while said push button assembly means is in said operating condition.

5. A combination according to claim 4 in which said push actuator means has a downward vertical bar which passes downwardly into said lamp holder means and vertically reciprocates said plunger.

6. In combination:

a casing having a receiving casing aperture means;

a push-button assembly means insertable in and removable from said casing through said aperture means and including:

an inward push actuator means and a lamp holder means relatively movably secured together and being insertable into and removable from said casing as a unit, said push button assembly means being disposed in said aperture means and when in a locked condition therein said push actuator means being actuatable to actuated condition and unactuated condition by pushing in action and release action of said push actuator means;

locking means carried by said casing and said push button assembly means locking said lamp holder means in said locked condition in said casing by an initial pushing in action of said push actuator means, followed by a releasing action of said push actuator means, and including an outwardly extending latching shoulder means and an outwardly slanting wedge means below said shoulder means on said lamp holder means, and an upwardly directed and inwardly biased locking lever means carried by said casing and having a shoulder latching locking lever upper end, said locking lever upper end being outwardly moved by said wedge means and then released to lock over said shoulder means during said initial pushing in action;

and withdrawing means carried by said push-button assembly means and operatively associated with said locking lever means for moving said locking lever means to an unlocking position thereof to withdraw said lamp holder means from said locked condition by a releasing pulling out action followed by a releasing pushing in action of said push actuator means, and including cam means upwardly and downwardly slidable on said lamp holder means adjacent said shoulder means, an outwardly biased and downwardly directed push actuator lever means passing through said lamp holder means, passing down past said cam means, and engaging a stop means to stop said initial pushing in action, said actuator lever means passing upwardly past said cam means and spring biasing over said cam means during said releasing pulling out action and then pushing said cam means down during said releasing pushing in action to push said latching locking lever upper end ofl? said shoulder means to release said lamp holder means from latched condition to remove said push actuator means and said lamp holder means as a unit out of said aperture means.

7. A combination according to claim 6, in which said push actuator lever means is free of actuating engagement with said cam means during said initial locking pushing in action of said push actuator means, said push actuator lever means being in downward actuating action with said cam means to cause said cam means to hold said locking lever upper end out of latching engagement with said shoulder means during said initial pulling out action of said actuator means followed by said releasing pushing in action of said actuator means.

8. A combination according to claim 7 in which said push actuator lever means has an inward biasing bend to hold said push actuator lever means free of actuating engagement with said cam means during said initial locking pushing in action and said casing has upward biasing means moving said lamp holder means upwardly to cause said push actuator lever and cam means to hold said locking lever means upper end outwardly of said shoulder means during said initial pulling out action and releasing pushing in action of said actuator means to release said push button assembly means from said operable locked condition.

9. A combination according to claim 8 in which said upward biasing means includes a support base in said casing with upwardly biased lamp contactors upwardly pushing said lamp holder means.

10. A combination according to claim 6 in which said casing has an upwardly biased switch means actuating plunger and said push actuator means has a vertical connector bar engaging and disengaging said plunger to actu ate and deactuate said switch means while said push button assembly means is in operable locked condition in said casing.

11. In combination:

a casing having a receiving casing aperture means;

an inward push actuator means and a lamp holder means relatively movably secured together and being insertable into and removable from said casing as an insertable and removable push-button assembly unit, said push-button assembly unit being disposed in said aperture means and when in a locked condition therein said push actuator means being actuta ble to actuated condition and unactuated condition by pushing in action and release action of said push actuator means;

locking means carried by said push-button assembly unit and said casing locking said lamp holder means in said locked condition in said casing by an initial pushing in action of said push actuator means, followed by a releasing action of said push actuator means, and including an outwardly extending latching shoulder means and an outwardly extending wedge means below said shoulder means on said lamp holder means, and an upwardly directed and inwardly biased locking lever means carried by said casing and having a shoulder latching locking lever upper end, said locking lever upper end being outwardly moved by said wedge means and then released to lock over said shoulder means during said initial pushing in action,

and withdrawing means carried by said push-button assembly unit and operatively associated with said locking lever means for moving said locking lever means to unlocking position thereof to withdraw said lamp holder means for said locked condition by a releasing pulling out action followed by a releasing pushing in action of said push actuator means,

and including cam means upwardly and downwardly movable on said lamp holder means, an outwardly biased and downwardly directed push actuator lever means passing down past said cam means, and engaging a stop means to stop said initial pushing in action, said actuator lever means passing upwardly past said cam means and hoving over said cam means during said releasing pulling out action and then pushing said cam means down during said releasing pushing in action to push said latching locking lever upper end ofi said shoulder means to release said lamp holder means from latched condition to remove said push actuator means and said lamp holder means as a unit out of said aperture means.

12. A combination according to clainr 11, in which said actuator lever means is in downward actuating action with said cam means to cause said cam means to hold said locking lever upper end out of latching engagement with said shoulder means during said initial pulling out action of said push actuator means followed by said releasing pushing in action of said push actuator means.

13. A combination according to claim 12 in which said actuator lever means has means to hold said actuator lever means free of actuating engagement with said cam means during said initial locking pushing in action and said casing has upward biasing means moving said lamp holder means upwardly to cause said actuator lever means and cam means to hold said locking lever means upper end outwardly of said shoulder means during said initial pulling out action and releasing pushing in action of said push actuator means to release said lamp holder means from said operable locked condition.

14. A combination according to claim 13 in which said upward biasing means includes a support base in said casing wit-h upwardly biased lamp contactors upwardly pushing said lamp holder means.

15. A combination according to claim 11 in which said casing has an upwardly biased switch means actuating plunger and said push actuator means has a vertical connector bar engaging and disengaging said plunger to actuate and deactuate said switch means while said lamp holder means is in operable looked condition in said casing.

References Cited UNITED STATES PATENTS 2,904,662 9/1959 Spring 200-159 3,090,949 5/1963 Hallerberg 200-159 3,197,598 7/ 1965 Andersen et al.

3,249,705 5/1966 Amis et al.

3,267,245 8/ 1966 Vincent.

3,274,354 9/1966 Stevens.

HERMAN 0*. JONES, Primary Examiner 

